An h∞ Robust Control Method for Mode Switching in Hybrid Power-split Hybrid Powertrain

Abstract

The invention relates to an H infinite robust control method for mode switching of a composite power split hybrid power system, comprising an engine start-up and an engine torque switching phase. In the engine startup phase, the engine torque of the first and second electric machines and the torque change when the first brake is turned on are determined by using dynamic programming and H infiniterobust control method. The output shaft of the engine is accelerated by the power split hybrid system under the premise that the torque at the power output end changes steadily and continuously. Whenthe engine speed reaches the idle speed, the engine ECU issues the fuel injection ignition command, the engine starts to output the torque, completes the engine torque switching, and enters the powersplit hybrid mode. Compared with the prior art, the invention can suppress the torque control error caused by the parameter perturbation and the torque fluctuation of the system in the mode switchingprocess, and realize the optimal comprehensive performance such as the switching time, the smoothness of the mode switching process, the vehicle power performance, the brake sliding friction work andthe like.

Description

technical field [0001] The invention relates to the field of hybrid vehicle control, in particular to an H∞ robust control method for mode switching of a composite power split hybrid power system. Background technique [0002] In order to meet the increasingly stringent fuel consumption and emission regulations at this stage, the development of hybrid vehicles has become an inevitable choice for major car companies, and power split systems are one of the mainstream solutions for deep and plug-in hybrid vehicles. The power split hybrid power system can make the engine work at its best fuel consumption line through the adjustment of the motor torque, so as to improve the fuel economy of the whole vehicle. However, in the process of vehicle operation, in order to adapt to different driving conditions, it is necessary to switch the working mode frequently to meet the system dynamics and improve work efficiency. The mode switching process of the power split hybrid system involve...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of smoothness and engine starting in the switching from the pure electric mode of the power split hybrid power system to the power split hybrid power mode in the above-mentioned prior art, and provide a compound power split hybrid power system mode switch The H∞ robust control method of

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